I admit that Trump has a couple of ok points about problems with the US system, and so I can understand this appeal. But here are the problems:
1) he has no real, honest solutions for our problems. He displays no real political skill apart from being a demagogue. He's not even a good businessman. He's a conman, he's corrupt, he's a crook. His wall is a joke. His deportation plan is grotesque. Trade agreements are there for a reason and will ruin the economy if we back out of them. Washington is not going to change because he is elected, unless he becomes a dictator, and if so, then he will have destroyed this country, not saved it.
2) he won't admit the real problems of capitalism run amok-- excessive greed is the problem for so many of the econbomic problems in the US. He doesn't discuss the environment at all, he won't recognize the incredible danger of climate change. His election would be a disaster for the natural world.
3) he has run an incredibly ugly campaign, where he's insulted every possible group, showing open racism and sexism. He's preferred to lie and to construct conspiracies over presenting any sort of honest argument. His campaign isn't even well organized. It's filled with amateurs and hacks. He's easily run the worst presidential campaign I've ever seen in my life.
He deserves to lose, and lose badly.
And if he wins, American deserves him...